Cleanup usage of scoped_ptr<> in remoting for C++11

remoting/host/basic_desktop_environment.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/host/basic_desktop_environment.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "remoting/host/audio_capturer.h"
@@ skipping 19 matching lines @@
 
 scoped_ptr<InputInjector> BasicDesktopEnvironment::CreateInputInjector() {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 
   return InputInjector::Create(input_task_runner(), ui_task_runner());
 }
 
 scoped_ptr<ScreenControls> BasicDesktopEnvironment::CreateScreenControls() {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 
-  return scoped_ptr<ScreenControls>();
+  return nullptr;
 }
 
 scoped_ptr<webrtc::MouseCursorMonitor>
 BasicDesktopEnvironment::CreateMouseCursorMonitor() {
   return scoped_ptr<webrtc::MouseCursorMonitor>(
       webrtc::MouseCursorMonitor::CreateForScreen(
           *desktop_capture_options_,
           webrtc::kFullDesktopScreenId));
 }
 
 std::string BasicDesktopEnvironment::GetCapabilities() const {
   return std::string();
 }
 
 void BasicDesktopEnvironment::SetCapabilities(const std::string& capabilities) {
 }
 
 scoped_ptr<GnubbyAuthHandler> BasicDesktopEnvironment::CreateGnubbyAuthHandler(
     protocol::ClientStub* client_stub) {
-  return scoped_ptr<GnubbyAuthHandler>();
+  return nullptr;
 }
 
 scoped_ptr<webrtc::DesktopCapturer>
 BasicDesktopEnvironment::CreateVideoCapturer() {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 
   // The basic desktop environment does not use X DAMAGE, since it is
   // broken on many systems - see http://crbug.com/73423.
   return scoped_ptr<webrtc::DesktopCapturer>(
       webrtc::ScreenCapturer::Create(*desktop_capture_options_));
@@ skipping 24 matching lines @@
 BasicDesktopEnvironmentFactory::~BasicDesktopEnvironmentFactory() {
 }
 
 bool BasicDesktopEnvironmentFactory::SupportsAudioCapture() const {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 
   return AudioCapturer::IsSupported();
 }
 
 }  // namespace remoting